Adds QCompleter in server room and a setting to enable/disable it.

This update address's the issue were a server with no db has only non-registered users but when creating a game will cause the dialogue to only allow the check box of "registered users only" resulting in a game that no user will ever be able to join.

When logging in and receiving a reply that isn't understood, show a more informative error message.

`tr() + tr()` for better translation flexibility.

See https://github.com/Cockatrice/Cockatrice/pull/1340 for details.

Moved setting files & Added code for a future portable build

See https://github.com/Cockatrice/Cockatrice/pull/1340 for details.

Updated server and client ping to 5 seconds.  Also changed hard set 1 second value on the ping timers to read values from the settings cache.

This adds the ability to select previous servers from a list to connect
to.

You can remove items from the drop down by selecting them and pressing
delete.

If you connect to a new host it will be added to the previous hosts.

It will remember the last host connected to in the dropdown.

As seen in this image, you cant see where you are logged in.

How it looks now: